Orbital Periods and Zodiac Signs: Average Time of Celestial Bodies in One Sign

This article examines the average time each celestial body Moon, Sun and planets spends in a single zodiac sign (30°), calculated from their orbital periods around the Sun (sidereal year for planets and tropical year for the Sun) divided by twelve. The results show significant differences in speed and duration among the bodies: from the Moon’s rapid 2.28 days per sign to Pluto’s highly variable average of about 20.66 years per sign. The study highlights that these are mean values derived from orbital geometry, which do not account for retrograde motion, orbital eccentricity, or axial tilt. Such factors cause substantial variations in actual time spent in each zodiac sign, especially for Mercury, Venus and Pluto. This comparative approach illustrates both the astronomical basis of orbital periods and their cultural reflection in zodiacal symbolism.